Keystones — Capstone
Five GCSE retrieval questions · 16 June 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 49°
Answer: 175.cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 8:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 75, 10, 32, 78, 76, 60
Answer: Mean = 56.4, Median = 64, Range = 68